A fun project to do with your children or grandchildren: make a house of sunflowers and morning glories.
Sunflower houses are not an exact science, which is a great part of their charm. All you need are the flower seeds and a patch of open ground that gets plenty of sunshine.
Choose a sunflower that grows tall but also makes some branches, rather than an old-fashioned type that goes straight up and then hangs its heavy head. ‘Giant Sungold’, ‘Soroya,’ and the pale-flowered ‘Moonwalker’ are good choices. Make sure the morning glories are the climbing sort; it’s hard to beat good old ‘Heavenly Blue’ in this situation.
Wearing gloves, use agricultural lime to draw the shape of your house on the grass. (Don’t make it too small. When the plants are full grown, the walls will be about 3 feet thick.) Following the line, remove a foot-wide strip of sod. Enrich the exposed soil with some compost and well-rotted manure.
After all danger of frost is past, plant sunflowers about 3 feet apart, arranging a triangle of seeds at each location and spacing the seeds in the triangle about 2 inches apart. (Don’t forget to leave space for the door!)
When the sunflowers have four leaves, cut off the weaker extras. You should now have single, strong plants, spaced evenly around your perimeter. Wait until they’re 2 feet tall, then plant morning glories every 4 inches or so in the spaces between them. When the vines sprout, use thin twigs to train them toward the sunflowers.
Resist the temptation to fertilize. Sunflowers that grow tall too quickly are prone to falling over; and morning glories that get lots to eat make leaves instead of flowers.